Algebra-1

Question Analysis
This question involves finding the total frequency of intervals that fit a compound condition ("more than 5 minutes but fewer than 18 minutes") in a histogram.
The main focus is on identifying which intervals satisfy both parts of the condition and summing their frequencies.

Key Concept Explanation
Compound Condition Frequencies: For conditions with two thresholds (e.g., "more than 5 and fewer than 18"), we include intervals that lie entirely between the thresholds. This requires checking that the interval’s lower bound > 5 and upper bound < 18.

Step-by-Step Solution
Identify intervals that meet "more than 5 minutes but fewer than 18 minutes":
6–11 minutes: Lower bound (6) > 5, upper bound (11) < 18 → qualifies.
12–17 minutes: Lower bound (12) > 5, ...